IBM 5155 Manual To Operations page 55

C
B One short beep will be heard when the test
finishes successfully.
The "IBM Personal Computer BASIC" message
will appear. (If, at the end of POST, a program
or an operating system from a fixed disk drive or
diskette is automatically loaded, the first screen
presentation from the program or operating
system will appear).
The IBM Personal Computer Basic
Version CX.XX Copyright IBM Corp. XXXX
XXXXX Bytes free
Ok
lLiST 2RUN 3LOAO" 4SAVE" 5CONT 6LPTl '7TRON BTROFF 9KEY OSCREEN
Did A, B, and C occur?
YES - Go to "Diskette Format Procedure" on page
Start 40-1.
NO - Go to "POST Errors" on the next page.
January 1984
Start 30-3